Adding upstream version 3.0.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/languages/conda_test.py

@@ -1,9 +1,13 @@
 from __future__ import annotations
 
+import os.path
+
 import pytest
 
 from pre_commit import envcontext
-from pre_commit.languages.conda import _conda_exe
+from pre_commit.languages import conda
+from pre_commit.store import _make_local_repo
+from testing.language_helpers import run_language
 
 
 @pytest.mark.parametrize(
@@ -37,4 +41,32 @@ from pre_commit.languages.conda import _conda_exe
 )
 def test_conda_exe(ctx, expected):
     with envcontext.envcontext(ctx):
-        assert _conda_exe() == expected
+        assert conda._conda_exe() == expected
+
+
+def test_conda_language(tmp_path):
+    environment_yml = '''\
+channels: [conda-forge, defaults]
+dependencies: [python, pip]
+'''
+    tmp_path.joinpath('environment.yml').write_text(environment_yml)
+
+    ret, out = run_language(
+        tmp_path,
+        conda,
+        'python -c "import sys; print(sys.prefix)"',
+    )
+    assert ret == 0
+    assert os.path.basename(out.strip()) == b'conda-default'
+
+
+def test_conda_additional_deps(tmp_path):
+    _make_local_repo(tmp_path)
+
+    ret = run_language(
+        tmp_path,
+        conda,
+        'python -c "import botocore; print(1)"',
+        deps=('botocore',),
+    )
+    assert ret == (0, b'1\n')

tests/languages/coursier_test.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import pytest
+
+from pre_commit.errors import FatalError
+from pre_commit.languages import coursier
+from testing.language_helpers import run_language
+
+
+def test_coursier_hook(tmp_path):
+    echo_java_json = '''\
+{
+  "repositories": ["central"],
+  "dependencies": ["io.get-coursier:echo:latest.stable"]
+}
+'''
+
+    channel_dir = tmp_path.joinpath('.pre-commit-channel')
+    channel_dir.mkdir()
+    channel_dir.joinpath('echo-java.json').write_text(echo_java_json)
+
+    ret = run_language(
+        tmp_path,
+        coursier,
+        'echo-java',
+        args=('Hello', 'World', 'from', 'coursier'),
+    )
+    assert ret == (0, b'Hello World from coursier\n')
+
+
+def test_coursier_hook_additional_dependencies(tmp_path):
+    ret = run_language(
+        tmp_path,
+        coursier,
+        'scalafmt --version',
+        deps=('scalafmt:3.6.1',),
+    )
+    assert ret == (0, b'scalafmt 3.6.1\n')
+
+
+def test_error_if_no_deps_or_channel(tmp_path):
+    with pytest.raises(FatalError) as excinfo:
+        run_language(tmp_path, coursier, 'dne')
+    msg, = excinfo.value.args
+    assert msg == 'expected .pre-commit-channel dir or additional_dependencies'

tests/languages/dart_test.py

@@ -0,0 +1,62 @@
+from __future__ import annotations
+
+import re_assert
+
+from pre_commit.languages import dart
+from pre_commit.store import _make_local_repo
+from testing.language_helpers import run_language
+
+
+def test_dart(tmp_path):
+    pubspec_yaml = '''\
+environment:
+  sdk: '>=2.10.0 <3.0.0'
+
+name: hello_world_dart
+
+executables:
+    hello-world-dart:
+
+dependencies:
+  ansicolor: ^2.0.1
+'''
+    hello_world_dart_dart = '''\
+import 'package:ansicolor/ansicolor.dart';
+
+void main() {
+    AnsiPen pen = new AnsiPen()..red();
+    print("hello hello " + pen("world"));
+}
+'''
+    tmp_path.joinpath('pubspec.yaml').write_text(pubspec_yaml)
+    bin_dir = tmp_path.joinpath('bin')
+    bin_dir.mkdir()
+    bin_dir.joinpath('hello-world-dart.dart').write_text(hello_world_dart_dart)
+
+    expected = (0, b'hello hello world\n')
+    assert run_language(tmp_path, dart, 'hello-world-dart') == expected
+
+
+def test_dart_additional_deps(tmp_path):
+    _make_local_repo(str(tmp_path))
+
+    ret = run_language(
+        tmp_path,
+        dart,
+        'hello-world-dart',
+        deps=('hello_world_dart',),
+    )
+    assert ret == (0, b'hello hello world\n')
+
+
+def test_dart_additional_deps_versioned(tmp_path):
+    _make_local_repo(str(tmp_path))
+
+    ret, out = run_language(
+        tmp_path,
+        dart,
+        'secure-random -l 4 -b 16',
+        deps=('encrypt:5.0.0',),
+    )
+    assert ret == 0
+    re_assert.Matches('^[a-f0-9]{8}\n$').assert_matches(out.decode())

tests/languages/golang_test.py

@@ -1,22 +1,43 @@
 from __future__ import annotations
 
+import re
+from unittest import mock
+
 import pytest
 
-from pre_commit.languages.golang import guess_go_dir
+import pre_commit.constants as C
+from pre_commit.languages import golang
+from pre_commit.languages import helpers
 
 
-@pytest.mark.parametrize(
-    ('url', 'expected'),
-    (
-        ('/im/a/path/on/disk', 'unknown_src_dir'),
-        ('file:///im/a/path/on/disk', 'unknown_src_dir'),
-        ('git@github.com:golang/lint', 'github.com/golang/lint'),
-        ('git://github.com/golang/lint', 'github.com/golang/lint'),
-        ('http://github.com/golang/lint', 'github.com/golang/lint'),
-        ('https://github.com/golang/lint', 'github.com/golang/lint'),
-        ('ssh://git@github.com/golang/lint', 'github.com/golang/lint'),
-        ('git@github.com:golang/lint.git', 'github.com/golang/lint'),
-    ),
-)
-def test_guess_go_dir(url, expected):
-    assert guess_go_dir(url) == expected
+ACTUAL_GET_DEFAULT_VERSION = golang.get_default_version.__wrapped__
+
+
+@pytest.fixture
+def exe_exists_mck():
+    with mock.patch.object(helpers, 'exe_exists') as mck:
+        yield mck
+
+
+def test_golang_default_version_system_available(exe_exists_mck):
+    exe_exists_mck.return_value = True
+    assert ACTUAL_GET_DEFAULT_VERSION() == 'system'
+
+
+def test_golang_default_version_system_not_available(exe_exists_mck):
+    exe_exists_mck.return_value = False
+    assert ACTUAL_GET_DEFAULT_VERSION() == C.DEFAULT
+
+
+ACTUAL_INFER_GO_VERSION = golang._infer_go_version.__wrapped__
+
+
+def test_golang_infer_go_version_not_default():
+    assert ACTUAL_INFER_GO_VERSION('1.19.4') == '1.19.4'
+
+
+def test_golang_infer_go_version_default():
+    version = ACTUAL_INFER_GO_VERSION(C.DEFAULT)
+
+    assert version != C.DEFAULT
+    assert re.match(r'^\d+\.\d+\.\d+$', version)

tests/languages/helpers_test.py

@@ -12,7 +12,6 @@ from pre_commit import parse_shebang
 from pre_commit.languages import helpers
 from pre_commit.prefix import Prefix
 from pre_commit.util import CalledProcessError
-from testing.auto_namedtuple import auto_namedtuple
 
 
 @pytest.fixture
@@ -94,31 +93,22 @@ def test_assert_no_additional_deps():
     )
 
 
-SERIAL_FALSE = auto_namedtuple(require_serial=False)
-SERIAL_TRUE = auto_namedtuple(require_serial=True)
-
-
 def test_target_concurrency_normal():
     with mock.patch.object(multiprocessing, 'cpu_count', return_value=123):
         with mock.patch.dict(os.environ, {}, clear=True):
-            assert helpers.target_concurrency(SERIAL_FALSE) == 123
-
-
-def test_target_concurrency_cpu_count_require_serial_true():
-    with mock.patch.dict(os.environ, {}, clear=True):
-        assert helpers.target_concurrency(SERIAL_TRUE) == 1
+            assert helpers.target_concurrency() == 123
 
 
 def test_target_concurrency_testing_env_var():
     with mock.patch.dict(
             os.environ, {'PRE_COMMIT_NO_CONCURRENCY': '1'}, clear=True,
     ):
-        assert helpers.target_concurrency(SERIAL_FALSE) == 1
+        assert helpers.target_concurrency() == 1
 
 
 def test_target_concurrency_on_travis():
     with mock.patch.dict(os.environ, {'TRAVIS': '1'}, clear=True):
-        assert helpers.target_concurrency(SERIAL_FALSE) == 2
+        assert helpers.target_concurrency() == 2
 
 
 def test_target_concurrency_cpu_count_not_implemented():
@@ -126,10 +116,20 @@ def test_target_concurrency_cpu_count_not_implemented():
             multiprocessing, 'cpu_count', side_effect=NotImplementedError,
     ):
         with mock.patch.dict(os.environ, {}, clear=True):
-            assert helpers.target_concurrency(SERIAL_FALSE) == 1
+            assert helpers.target_concurrency() == 1
 
 
 def test_shuffled_is_deterministic():
     seq = [str(i) for i in range(10)]
     expected = ['4', '0', '5', '1', '8', '6', '2', '3', '7', '9']
     assert helpers._shuffled(seq) == expected
+
+
+def test_xargs_require_serial_is_not_shuffled():
+    ret, out = helpers.run_xargs(
+        ('echo',), [str(i) for i in range(10)],
+        require_serial=True,
+        color=False,
+    )
+    assert ret == 0
+    assert out.strip() == b'0 1 2 3 4 5 6 7 8 9'

tests/languages/lua_test.py

@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+import sys
+
+import pytest
+
+from pre_commit.languages import lua
+from pre_commit.util import make_executable
+from testing.language_helpers import run_language
+
+pytestmark = pytest.mark.skipif(
+    sys.platform == 'win32',
+    reason='lua is not supported on windows',
+)
+
+
+def test_lua(tmp_path):  # pragma: win32 no cover
+    rockspec = '''\
+package = "hello"
+version = "dev-1"
+
+source = {
+   url = "git+ssh://git@github.com/pre-commit/pre-commit.git"
+}
+description = {}
+dependencies = {}
+build = {
+    type = "builtin",
+    modules = {},
+    install = {
+        bin = {"bin/hello-world-lua"}
+    },
+}
+'''
+    hello_world_lua = '''\
+#!/usr/bin/env lua
+print('hello world')
+'''
+    tmp_path.joinpath('hello-dev-1.rockspec').write_text(rockspec)
+    bin_dir = tmp_path.joinpath('bin')
+    bin_dir.mkdir()
+    bin_file = bin_dir.joinpath('hello-world-lua')
+    bin_file.write_text(hello_world_lua)
+    make_executable(bin_file)
+
+    expected = (0, b'hello world\n')
+    assert run_language(tmp_path, lua, 'hello-world-lua') == expected
+
+
+def test_lua_additional_dependencies(tmp_path):  # pragma: win32 no cover
+    ret, out = run_language(
+        tmp_path,
+        lua,
+        'luacheck --version',
+        deps=('luacheck',),
+    )
+    assert ret == 0
+    assert out.startswith(b'Luacheck: ')

tests/languages/perl_test.py

@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+from pre_commit.languages import perl
+from pre_commit.store import _make_local_repo
+from pre_commit.util import make_executable
+from testing.language_helpers import run_language
+
+
+def test_perl_install(tmp_path):
+    makefile_pl = '''\
+use strict;
+use warnings;
+
+use ExtUtils::MakeMaker;
+
+WriteMakefile(
+    NAME => "PreCommitHello",
+    VERSION_FROM => "lib/PreCommitHello.pm",
+    EXE_FILES => [qw(bin/pre-commit-perl-hello)],
+);
+'''
+    bin_perl_hello = '''\
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use PreCommitHello;
+
+PreCommitHello::hello();
+'''
+    lib_hello_pm = '''\
+package PreCommitHello;
+
+use strict;
+use warnings;
+
+our $VERSION = "0.1.0";
+
+sub hello {
+    print "Hello from perl-commit Perl!\n";
+}
+
+1;
+'''
+    tmp_path.joinpath('Makefile.PL').write_text(makefile_pl)
+    bin_dir = tmp_path.joinpath('bin')
+    bin_dir.mkdir()
+    exe = bin_dir.joinpath('pre-commit-perl-hello')
+    exe.write_text(bin_perl_hello)
+    make_executable(exe)
+    lib_dir = tmp_path.joinpath('lib')
+    lib_dir.mkdir()
+    lib_dir.joinpath('PreCommitHello.pm').write_text(lib_hello_pm)
+
+    ret = run_language(tmp_path, perl, 'pre-commit-perl-hello')
+    assert ret == (0, b'Hello from perl-commit Perl!\n')
+
+
+def test_perl_additional_dependencies(tmp_path):
+    _make_local_repo(str(tmp_path))
+
+    ret, out = run_language(
+        tmp_path,
+        perl,
+        'perltidy --version',
+        deps=('SHANCOCK/Perl-Tidy-20211029.tar.gz',),
+    )
+    assert ret == 0
+    assert out.startswith(b'This is perltidy, v20211029')

tests/languages/r_test.py

@@ -1,136 +1,119 @@
 from __future__ import annotations
 
 import os.path
+import shutil
 
 import pytest
 
 from pre_commit import envcontext
 from pre_commit.languages import r
+from pre_commit.prefix import Prefix
+from pre_commit.store import _make_local_repo
 from pre_commit.util import win_exe
-from testing.fixtures import make_config_from_repo
-from testing.fixtures import make_repo
-from tests.repository_test import _get_hook_no_install
+from testing.language_helpers import run_language
 
 
-def _test_r_parsing(
-    tempdir_factory,
-    store,
-    hook_id,
-    expected_hook_expr={},
-    expected_args={},
-    config={},
-    expect_path_prefix=True,
-):
-    repo_path = 'r_hooks_repo'
-    path = make_repo(tempdir_factory, repo_path)
-    config = config or make_config_from_repo(path)
-    hook = _get_hook_no_install(config, store, hook_id)
-    ret = r._cmd_from_hook(hook)
-    expected_cmd = 'Rscript'
-    expected_opts = (
+def test_r_parsing_file_no_opts_no_args(tmp_path):
+    cmd = r._cmd_from_hook(
+        Prefix(str(tmp_path)),
+        'Rscript some-script.R',
+        (),
+        is_local=False,
+    )
+    assert cmd == (
+        'Rscript',
         '--no-save', '--no-restore', '--no-site-file', '--no-environ',
+        str(tmp_path.joinpath('some-script.R')),
     )
-    expected_path = os.path.join(
-        hook.prefix.prefix_dir if expect_path_prefix else '',
-        f'{hook_id}.R',
-    )
-    expected = (
-        expected_cmd,
-        *expected_opts,
-        *(expected_hook_expr or (expected_path,)),
-        *expected_args,
-    )
-    assert ret == expected
 
 
-def test_r_parsing_file_no_opts_no_args(tempdir_factory, store):
-    hook_id = 'parse-file-no-opts-no-args'
-    _test_r_parsing(tempdir_factory, store, hook_id)
-
-
-def test_r_parsing_file_opts_no_args(tempdir_factory, store):
+def test_r_parsing_file_opts_no_args():
     with pytest.raises(ValueError) as excinfo:
         r._entry_validate(['Rscript', '--no-init', '/path/to/file'])
 
-    msg = excinfo.value.args
+    msg, = excinfo.value.args
     assert msg == (
-        'The only valid syntax is `Rscript -e {expr}`',
-        'or `Rscript path/to/hook/script`',
+        'The only valid syntax is `Rscript -e {expr}`'
+        'or `Rscript path/to/hook/script`'
     )
 
 
-def test_r_parsing_file_no_opts_args(tempdir_factory, store):
-    hook_id = 'parse-file-no-opts-args'
-    expected_args = ['--no-cache']
-    _test_r_parsing(
-        tempdir_factory, store, hook_id, expected_args=expected_args,
+def test_r_parsing_file_no_opts_args(tmp_path):
+    cmd = r._cmd_from_hook(
+        Prefix(str(tmp_path)),
+        'Rscript some-script.R',
+        ('--no-cache',),
+        is_local=False,
+    )
+    assert cmd == (
+        'Rscript',
+        '--no-save', '--no-restore', '--no-site-file', '--no-environ',
+        str(tmp_path.joinpath('some-script.R')),
+        '--no-cache',
     )
 
 
-def test_r_parsing_expr_no_opts_no_args1(tempdir_factory, store):
-    hook_id = 'parse-expr-no-opts-no-args-1'
-    _test_r_parsing(
-        tempdir_factory, store, hook_id, expected_hook_expr=('-e', '1+1'),
+def test_r_parsing_expr_no_opts_no_args1(tmp_path):
+    cmd = r._cmd_from_hook(
+        Prefix(str(tmp_path)),
+        "Rscript -e '1+1'",
+        (),
+        is_local=False,
+    )
+    assert cmd == (
+        'Rscript',
+        '--no-save', '--no-restore', '--no-site-file', '--no-environ',
+        '-e', '1+1',
     )
 
 
-def test_r_parsing_expr_no_opts_no_args2(tempdir_factory, store):
-    with pytest.raises(ValueError) as execinfo:
+def test_r_parsing_local_hook_path_is_not_expanded(tmp_path):
+    cmd = r._cmd_from_hook(
+        Prefix(str(tmp_path)),
+        'Rscript path/to/thing.R',
+        (),
+        is_local=True,
+    )
+    assert cmd == (
+        'Rscript',
+        '--no-save', '--no-restore', '--no-site-file', '--no-environ',
+        'path/to/thing.R',
+    )
+
+
+def test_r_parsing_expr_no_opts_no_args2():
+    with pytest.raises(ValueError) as excinfo:
         r._entry_validate(['Rscript', '-e', '1+1', '-e', 'letters'])
-    msg = execinfo.value.args
-    assert msg == ('You can supply at most one expression.',)
+    msg, = excinfo.value.args
+    assert msg == 'You can supply at most one expression.'
 
 
-def test_r_parsing_expr_opts_no_args2(tempdir_factory, store):
-    with pytest.raises(ValueError) as execinfo:
+def test_r_parsing_expr_opts_no_args2():
+    with pytest.raises(ValueError) as excinfo:
         r._entry_validate(
-            [
-                'Rscript', '--vanilla', '-e', '1+1', '-e', 'letters',
-            ],
+            ['Rscript', '--vanilla', '-e', '1+1', '-e', 'letters'],
         )
-    msg = execinfo.value.args
+    msg, = excinfo.value.args
     assert msg == (
-        'The only valid syntax is `Rscript -e {expr}`',
-        'or `Rscript path/to/hook/script`',
+        'The only valid syntax is `Rscript -e {expr}`'
+        'or `Rscript path/to/hook/script`'
     )
 
 
-def test_r_parsing_expr_args_in_entry2(tempdir_factory, store):
-    with pytest.raises(ValueError) as execinfo:
+def test_r_parsing_expr_args_in_entry2():
+    with pytest.raises(ValueError) as excinfo:
         r._entry_validate(['Rscript', '-e', 'expr1', '--another-arg'])
 
-    msg = execinfo.value.args
-    assert msg == ('You can supply at most one expression.',)
+    msg, = excinfo.value.args
+    assert msg == 'You can supply at most one expression.'
 
 
-def test_r_parsing_expr_non_Rscirpt(tempdir_factory, store):
-    with pytest.raises(ValueError) as execinfo:
+def test_r_parsing_expr_non_Rscirpt():
+    with pytest.raises(ValueError) as excinfo:
         r._entry_validate(['AnotherScript', '-e', '{{}}'])
 
-    msg = execinfo.value.args
-    assert msg == ('entry must start with `Rscript`.',)
-
-
-def test_r_parsing_file_local(tempdir_factory, store):
-    path = 'path/to/script.R'
-    hook_id = 'local-r'
-    config = {
-        'repo': 'local',
-        'hooks': [{
-            'id': hook_id,
-            'name': 'local-r',
-            'entry': f'Rscript {path}',
-            'language': 'r',
-        }],
-    }
-    _test_r_parsing(
-        tempdir_factory,
-        store,
-        hook_id=hook_id,
-        expected_hook_expr=(path,),
-        config=config,
-        expect_path_prefix=False,
-    )
+    msg, = excinfo.value.args
+    assert msg == 'entry must start with `Rscript`.'
 
 
 def test_rscript_exec_relative_to_r_home():
@@ -142,3 +125,99 @@ def test_rscript_exec_relative_to_r_home():
 def test_path_rscript_exec_no_r_home_set():
     with envcontext.envcontext((('R_HOME', envcontext.UNSET),)):
         assert r._rscript_exec() == 'Rscript'
+
+
+def test_r_hook(tmp_path):
+    renv_lock = '''\
+{
+  "R": {
+    "Version": "4.0.3",
+    "Repositories": [
+      {
+        "Name": "CRAN",
+        "URL": "https://cloud.r-project.org"
+      }
+    ]
+  },
+  "Packages": {
+    "renv": {
+      "Package": "renv",
+      "Version": "0.12.5",
+      "Source": "Repository",
+      "Repository": "CRAN",
+      "Hash": "5c0cdb37f063c58cdab3c7e9fbb8bd2c"
+    },
+    "rprojroot": {
+      "Package": "rprojroot",
+      "Version": "1.0",
+      "Source": "Repository",
+      "Repository": "CRAN",
+      "Hash": "86704667fe0860e4fec35afdfec137f3"
+    }
+  }
+}
+'''
+    description = '''\
+Package: gli.clu
+Title: What the Package Does (One Line, Title Case)
+Type: Package
+Version: 0.0.0.9000
+Authors@R:
+    person(given = "First",
+           family = "Last",
+           role = c("aut", "cre"),
+           email = "first.last@example.com",
+           comment = c(ORCID = "YOUR-ORCID-ID"))
+Description: What the package does (one paragraph).
+License: `use_mit_license()`, `use_gpl3_license()` or friends to
+    pick a license
+Encoding: UTF-8
+LazyData: true
+Roxygen: list(markdown = TRUE)
+RoxygenNote: 7.1.1
+Imports:
+    rprojroot
+'''
+    hello_world_r = '''\
+stopifnot(
+    packageVersion('rprojroot') == '1.0',
+    packageVersion('gli.clu') == '0.0.0.9000'
+)
+cat("Hello, World, from R!\n")
+'''
+
+    tmp_path.joinpath('renv.lock').write_text(renv_lock)
+    tmp_path.joinpath('DESCRIPTION').write_text(description)
+    tmp_path.joinpath('hello-world.R').write_text(hello_world_r)
+    renv_dir = tmp_path.joinpath('renv')
+    renv_dir.mkdir()
+    shutil.copy(
+        os.path.join(
+            os.path.dirname(__file__),
+            '../../pre_commit/resources/empty_template_activate.R',
+        ),
+        renv_dir.joinpath('activate.R'),
+    )
+
+    expected = (0, b'Hello, World, from R!\n')
+    assert run_language(tmp_path, r, 'Rscript hello-world.R') == expected
+
+
+def test_r_inline(tmp_path):
+    _make_local_repo(str(tmp_path))
+
+    cmd = '''\
+Rscript -e '
+    stopifnot(packageVersion("rprojroot") == "1.0")
+    cat(commandArgs(trailingOnly = TRUE), "from R!\n", sep=", ")
+'
+'''
+
+    ret = run_language(
+        tmp_path,
+        r,
+        cmd,
+        deps=('rprojroot@1.0',),
+        args=('hi', 'hello'),
+    )
+    assert ret == (0, b'hi, hello, from R!\n')

tests/languages/ruby_test.py

@@ -71,10 +71,10 @@ def test_install_ruby_default(fake_gem_prefix):
 
 @xfailif_windows  # pragma: win32 no cover
 def test_install_ruby_with_version(fake_gem_prefix):
-    ruby.install_environment(fake_gem_prefix, '3.1.0', ())
+    ruby.install_environment(fake_gem_prefix, '3.2.0', ())
 
     # Should be able to activate and use rbenv install
-    with ruby.in_env(fake_gem_prefix, '3.1.0'):
+    with ruby.in_env(fake_gem_prefix, '3.2.0'):
         cmd_output('rbenv', 'install', '--help')
 
 

tests/languages/rust_test.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from typing import Mapping
 from unittest import mock
 
 import pytest
@@ -48,7 +49,9 @@ def test_installs_with_bootstrapped_rustup(tmpdir, language_version):
 
     original_find_executable = parse_shebang.find_executable
 
-    def mocked_find_executable(exe: str) -> str | None:
+    def mocked_find_executable(
+            exe: str, *, env: Mapping[str, str] | None = None,
+    ) -> str | None:
         """
         Return `None` the first time `find_executable` is called to ensure
         that the bootstrapping code is executed, then just let the function
@@ -59,7 +62,7 @@ def test_installs_with_bootstrapped_rustup(tmpdir, language_version):
         find_executable_exes.append(exe)
         if len(find_executable_exes) == 1:
             return None
-        return original_find_executable(exe)
+        return original_find_executable(exe, env=env)
 
     with mock.patch.object(parse_shebang, 'find_executable') as find_exe_mck:
         find_exe_mck.side_effect = mocked_find_executable

tests/languages/swift_test.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+import sys
+
+import pytest
+
+from pre_commit.languages import swift
+from testing.language_helpers import run_language
+
+
+@pytest.mark.skipif(
+    sys.platform == 'win32',
+    reason='swift is not supported on windows',
+)
+def test_swift_language(tmp_path):  # pragma: win32 no cover
+    package_swift = '''\
+// swift-tools-version:5.0
+import PackageDescription
+
+let package = Package(
+    name: "swift_hooks_repo",
+    targets: [.target(name: "swift_hooks_repo")]
+)
+'''
+    tmp_path.joinpath('Package.swift').write_text(package_swift)
+    src_dir = tmp_path.joinpath('Sources/swift_hooks_repo')
+    src_dir.mkdir(parents=True)
+    src_dir.joinpath('main.swift').write_text('print("Hello, world!")\n')
+
+    expected = (0, b'Hello, world!\n')
+    assert run_language(tmp_path, swift, 'swift_hooks_repo') == expected